'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
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.TH DMFE 4D "Sep 17, 2007"
.SH NAME
dmfe \- Davicom Fast Ethernet driver for Davicom DM9102A
.SH SYNOPSIS
.LP
.nf
/kernel/drv/sparcv9/dmfe
.fi

.SH DESCRIPTION
.sp
.LP
The \fBdmfe\fR Ethernet device provides 100Base-TX networking interfaces using
the Davicom DM9102A chip, which incorporates its own internal transceiver.
.sp
.LP
The \fBdmfe\fR driver functions include controller initialization, frame
transmit and receive, promiscuous and multicast support, and error recovery and
reporting. Multiple controllers installed within the system are supported by
the driver.
.sp
.LP
The 100Base-TX standard specifies an auto-negotiation protocol to automatically
select the mode and speed of operation. The internal transceiver is capable of
performing auto-negotiation with the remote-end of the link (link partner) and
receives the capabilities of the remote end. It selects the highest common
denominator mode of operation based on the priorities. The internal transceiver
also supports a forced-mode of operation under which the driver selects the
operational mode.
.SH APPLICATION PROGRAMMING INTERFACE
.sp
.LP
The \fB/dev/dmfe\fR cloning character-special device is used to access all
Davicom DM9102A devices installed in the system.
.sp
.LP
You must send an explicit DL_ATTACH_REQ message to associate the opened stream
with a particular device (ppa). The ppa ID is interpreted as an unsigned
integer data type and indicates the corresponding device  instance (unit)
number. If the ppa field value does not correspond to a valid device instance
number for this system, an error (DL_ERROR_ACK) is returned. The device is
initialized on first attach and de-initialized (stopped) at last detach.
.sp
.LP
The values returned by the driver in the DL_INFO_ACK primitive in response to a
DL_INFO_REQ are as follows:
.RS +4
.TP
.ie t \(bu
.el o
Maximum  SDU  is  1500  (ETHERMTU - defined  in \fBsys/ethernet.h\fR).
.RE
.RS +4
.TP
.ie t \(bu
.el o
Minimum SDU is 0.
.RE
.RS +4
.TP
.ie t \(bu
.el o
DLSAP address length is 8.
.RE
.RS +4
.TP
.ie t \(bu
.el o
MAC type is DL_ETHER.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The sap length value  is  -2,  meaning the physical address component is
followed immediately by a 2-byte sap component within the DLSAP address.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The broadcast address value is  the Ethernet/IEEE broadcast address
(FF:FF:FF:FF:FF:FF).
.RE
.sp
.LP
Once  in  the  DL_ATTACHED  state, you must send  a DL_BIND_REQ to  associate a
particular Service Access Point (SAP) with the stream.
.SH CONFIGURATION
.sp
.LP
By default, the \fBdmfe\fR driver performs auto-negotiation to select the speed
and mode of the link. Link speed and mode can be 100 Mbps (full or half-duplex)
or 10 Mbps (full or half-duplex) as described in the 100Base-TX standard.
.sp
.LP
The auto-negotiation protocol automatically selects speed mode (either 100 Mbps
or 10 Mbps) and operation mode (either full-duplex or half-duplex) as the
highest common denominator supported by both link partners. Because the
\fBdmfe\fR device supports all modes, this effectively selects the
highest-throughput mode supported by the other device.
.sp
.LP
Alternatively, you can explicitly specify the link parameters by adding entries
to the \fBdmfe\fR driver configuration file (\fB/kernel/drv/dmfe.conf\fR). You
can set the \fBspeed\fR parameter to 10 or 100 to force \fBdmfe\fR devices to
operate at the specified speed. Additionally, you can set the full-duplex
parameter to 0 or 1 to disable or force full-duplex operation, respectively.
.sp
.LP
Note that specifying either "speed" or "full-duplex" explicitly disables
auto-negotiation. To enable the driver to determine the appropriate setting for
each parameter, you should always set both parameters. If it is necessary to
force either speed or duplex setting (for example, because the  \fBdmfe\fR
device is connected to an ancient device or hub that does not support
auto-negotiation), both parameters should be explicitly specified to match the
requirements of the external device.
.SH FILES
.sp
.ne 2
.na
\fB\fB/dev/dmfe\fR\fR
.ad
.RS 28n
Character special device
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/dmfe\fR\fR
.ad
.RS 28n
32-bit kernel module (x86)
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/sparcv9/dmfe\fR\fR
.ad
.RS 28n
64-bit kernel module (SPARC)
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/amd64/dmfe\fR\fR
.ad
.RS 28n
64-bit kernel module (x86)
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/dmfe.conf\fR\fR
.ad
.RS 28n
\fBdmfe\fR configuration file
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	SPARC, x86
.TE

.SH SEE ALSO
.sp
.LP
.BR gld (4D),
.BR streamio (4I),
.BR dlpi (4P),
.BR attributes (7)
.sp
.LP
\fIWriting Device Drivers\fR
.sp
.LP
\fISTREAMS Programming Guide\fR
.sp
.LP
\fINetwork Interfaces Programmer's Guide\fR
